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A troubling new study has found that the number of chemicals capable of impairing child development worldwide is more than double what was previously believed， according to a new story by Time Magazine.
Back in 2006， researchers from the Harvard School of Public Health and the Icahn School of Medicine at Mount Sinai pinpointed five industrial chemicals that they linked to brain disorders such as autism， attention deficit hyperactivity disorder （ADHD）， reduced IQ， and more.
These chemicals were lead， methlymercury， polychlorinated biphenyls （a coolant fluid in motors）， arsenic （found naturally and also in pesticides）， and toluene （in paint thinner， nail polish， and more）.
In a review of their 2006 study， though， the same scientists have now discovered brain development in children could be negatively disrupted by another six chemicals. These chemicals are： chlorpyrifos， dichlorodiphenyltrichloroethane， fluoride， manganese， polybrominated diphenyl ethers， tetrachloroethylene.
Alarmingly， the researchers discovered that manganese and fluoride， both of which are present in drinking water， can lead to poorer performance in school， lower math scores， and increased hyperactivity. High levels of fluoride， in particular， are potentially capable of lowering a child's IQ by seven points.
Chlorpyrifos， meanwhile， is a common pesticide that is still used in public areas and in agriculture despite the fact that the Environmental Protection Agency banned it from residential areas in 2001. According to a report by CNN in 2012， even low levels of chlorpyrifos could result in disrupted brain development.
"It's out there and we do not know what the longer term impact is of lower levels，" Virginia Rauh， professor of Clinical Population and Family Health at Columbia University Mailman School of Public Health， told CNN. "But it does seem to be associated with cognitive damage and structural changes in brain."
As RT reported this week， some health experts believe the increased rate of severe birth defects in rural Washington state could possibly be linked to prolonged exposure to pesticides， though officials have been unable to determine the precise cause.
Despite the researchers’ claim that these new chemicals can contribute to brain disorders， they admitted they could not prove a direct causal link between a chemical and any one health issue. Still， they are pushing for increased public awareness considering the potential risks.
“The consequence of such brain damage is impaired [central nervous system] function that lasts a lifetime and might result in reduced intelligence， as expressed in terms of lost IQ points， or disruption in behavior，” the study reads， cited by Time and published in the Lancet Neurology journal.
时代杂志报道，一项最近研究发现，全世界造成儿童脑损伤的化学品比科学家估计的数量多一倍。2006年，哈佛大学公共健康学院及西奈的伊卡医学院的科学家们指出了五种可能会造成自闭症、多动症和智商下降等脑疾病的工业化学品：铅、甲基水银、多氯联苯（一种发动机冷却剂）、砷（自然界及杀虫剂中都有）和甲苯（涂料稀释剂和指甲油中都有）。后来科学家们又发现了另外六种对儿童大脑发育产生负面影响的化学品：毒死蜱、滴滴涕、氟化物、锰、多溴联苯醚、四氯乙烯。科学家还发现，饮用水中含有的锰和氟化物会导致学习成绩下降、数学成绩下降及多动。氟化物过多会导致智商下降7分。环境保护署自2001年就禁止了毒死蜱杀虫剂的使用，但时至今日公共场所及农业方面还在使用。哥伦比亚大学梅尔曼公共健康学院的弗吉尼亚·劳教授指出，尽管这些化学品与健康问题没有确定的直接联系，但它们造成的终身脑损伤会降低智力，或引起行为紊乱。
[http：//www.bbc.co.uk/news/health-26224812 ]
Back in 2006， researchers from the Harvard School of Public Health and the Icahn School of Medicine at Mount Sinai pinpointed five industrial chemicals that they linked to brain disorders such as autism， attention deficit hyperactivity disorder （ADHD）， reduced IQ， and more.
These chemicals were lead， methlymercury， polychlorinated biphenyls （a coolant fluid in motors）， arsenic （found naturally and also in pesticides）， and toluene （in paint thinner， nail polish， and more）.
In a review of their 2006 study， though， the same scientists have now discovered brain development in children could be negatively disrupted by another six chemicals. These chemicals are： chlorpyrifos， dichlorodiphenyltrichloroethane， fluoride， manganese， polybrominated diphenyl ethers， tetrachloroethylene.
Alarmingly， the researchers discovered that manganese and fluoride， both of which are present in drinking water， can lead to poorer performance in school， lower math scores， and increased hyperactivity. High levels of fluoride， in particular， are potentially capable of lowering a child's IQ by seven points.
Chlorpyrifos， meanwhile， is a common pesticide that is still used in public areas and in agriculture despite the fact that the Environmental Protection Agency banned it from residential areas in 2001. According to a report by CNN in 2012， even low levels of chlorpyrifos could result in disrupted brain development.
"It's out there and we do not know what the longer term impact is of lower levels，" Virginia Rauh， professor of Clinical Population and Family Health at Columbia University Mailman School of Public Health， told CNN. "But it does seem to be associated with cognitive damage and structural changes in brain."
As RT reported this week， some health experts believe the increased rate of severe birth defects in rural Washington state could possibly be linked to prolonged exposure to pesticides， though officials have been unable to determine the precise cause.
Despite the researchers’ claim that these new chemicals can contribute to brain disorders， they admitted they could not prove a direct causal link between a chemical and any one health issue. Still， they are pushing for increased public awareness considering the potential risks.
“The consequence of such brain damage is impaired [central nervous system] function that lasts a lifetime and might result in reduced intelligence， as expressed in terms of lost IQ points， or disruption in behavior，” the study reads， cited by Time and published in the Lancet Neurology journal.
时代杂志报道，一项最近研究发现，全世界造成儿童脑损伤的化学品比科学家估计的数量多一倍。2006年，哈佛大学公共健康学院及西奈的伊卡医学院的科学家们指出了五种可能会造成自闭症、多动症和智商下降等脑疾病的工业化学品：铅、甲基水银、多氯联苯（一种发动机冷却剂）、砷（自然界及杀虫剂中都有）和甲苯（涂料稀释剂和指甲油中都有）。后来科学家们又发现了另外六种对儿童大脑发育产生负面影响的化学品：毒死蜱、滴滴涕、氟化物、锰、多溴联苯醚、四氯乙烯。科学家还发现，饮用水中含有的锰和氟化物会导致学习成绩下降、数学成绩下降及多动。氟化物过多会导致智商下降7分。环境保护署自2001年就禁止了毒死蜱杀虫剂的使用，但时至今日公共场所及农业方面还在使用。哥伦比亚大学梅尔曼公共健康学院的弗吉尼亚·劳教授指出，尽管这些化学品与健康问题没有确定的直接联系，但它们造成的终身脑损伤会降低智力，或引起行为紊乱。
[http：//www.bbc.co.uk/news/health-26224812 ]